Steam-boiler.



PATENTED JAN. 14, 1908. '0. D. MOSHER. STEAM BOILER. APPLIOATION FILED DEO.17,1906.

2 SHEETS-SHEET 1'.

' v Quinnoz a, 3. M

No. 876,477 -.PATENTED JAN. 14, 1908. I

0. D. MOSHBR. STEAM BOILER.

APPLIGATION FILED DEO.l7.1906.

2 SHEETSSHEET 2.

g} moan fox LfAZM ofleua Q/Vifneowa CHARLES D. MOSHER, OF NEW YORK, N. Y.

STEAM-BOILER.

Specification of Letters Patent.

Patented Jan. 14, 1908.

Application filed December 17' 1906. Serial No. 348.299.

T 0 all whom it may concern:

Be it known that I, CHARLES D. MosHEn, a citizen of the United. States, residing at New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Steam- Boilers, of which the following is a specification.

This invention concerns the construction and location of superheaters in steam-boilers of the wateretube type with reference to the main boiler-structure, and the purpose of the invention is to secure for the superheater a most advantageous location in regard to the temperature of the gases which come in contact with it while at the same time securing increased durability and permanency and increased ease of repair.

Of the accompanying drawings, Figure 1 represents a longitudinal vertical-section showing a superheating-boiler constructed according to my invention. Fig. 2 TQPI'G1 sents a front elevation thereof, partly in. section.

The same reference characters indicate the same parts in both views.

In the drawings, 10 and 11 are parallel upper and lower transverse water-drums connected 'by an inclined group of water-tubes 12, 12, to which are preferably imparted such curvatures as will enable the tubes to be withdrawn and replaced through. a row of plug-holes in the front shell of the drum 10 which are provided with removable covers 13. These covers are here shown in the form of screwlugs, but any suitable style of cover or ller may be used.

14 is a longitudinal horizontal steam-andwater drum parallel with the planes of the tubes 12 and connected with the upper water-drum 10 by a short u )take pipe 15, and with the lower waterrum 11 by a longer downtake pipe 16. In a boiler of considerable width I prefer to provide a plurality of the steam-and-water drums 14, and have shown two such drums in Fig. 2, having similar connections with the drums 10 and 11 and having their steam-spaces joined by branch steam-pipes 17 into a common steam-pipe 18, the branch pipes taking steam from the drums 14 through longitudinal dry-pipes 19.

20 is the furnace-chamber located underneath the front portion of the water-tube group and assing its flaming gases upwardly across sa1 portion lnto an upper intermediate gas-chamber 21 located beneath the steam-and-water drums 14 and the roofof the boiler setting. A gas-balfle 22 extends across the tube-groin at right-angles from the bridge-wall 23 for guiding the gas-current, and a second baffle 24 in the rear of the first one extends part-way across the tubegroup from a vertical baflle-wall 25 which leads downwardly from the upper drums and casing-roof to the group of tubes 12. Thus the gases are guided-from chamber 21 in a downward return path across the tubes.

and around the lower edge of baffle 24, from which they pass again upwardly across the tubes to a rear gaschumber 26 and out through the stack intake-opening 27.

In the intermediate gaschamber 21 above the main group of tubes 12 I locate the superheater com )oscd of two parallel drums 28, 29, connected by an inclined group of tubes 30 which are curved for the same purpose and in the same manner as the main tubes 12, and are adapted to be inserted and Withdrawn through rows of holes in the drums 28, 29, which are located opposite the ends of the tubes and provided with screw-plugs 31, there being one row of plug-holes in each drum so that the tubes may be inserted and witlulrawn either from the front or therear of the superheater. The manner of w1thdrawing superheatcrtubes is indicated by dotted lines in Fig. 1. l/Vhen the tubes are withdrawn in a forward direction they pass out over the upper transverse water-drum 10 through doors 32 in the front wall of the boiler-casing, and are adapted to be passed on either side of the short uptake-pipes 15, the arrangement being such that a plurality of the superlwater-tubes in both vertical and horizontal directions may be withdrawn through any one plug-hole. When the superheatcr tubes are withdrawn rearwardly through the drum29 they may be'passed out through the stack inlet-opening 27 or through any opening located in a similar position in the rear casing-wall.

It will be noted that the forward superheater-drum 28 is supported on the upper side of the upper water-drum 10 while the lower superlieater drum 29 is supported in or on the rear bailie-wa'll 25, and the mounting of both drums may be of a substantial and permanent character, since the curvature of the tubes provides for taking up all expansion strains, and, owing to the manner of construction of the superheater, it will sel 'superheater have been dom be'necessary to remove the drums for the purpose of repairing any part of the superheater:

A permanent open connection exists between the dry-pipe 19 and. the lower superheaterdrum-29 by way of vertical pipes 33- extending'from the dry-pipes down through the bottoms of the steain-and.water drums 14 to the superheater-drum 29, and a second open connection exists by way of a vertical. pipe 34 extending upwardly from the upper su erheater-drum 28 to the steam-pi e 18. W en superheated steam 'is desire the branches 17 from the dry-pi es may be shut off by means of valves 35 t erein and then the steam asses from the dry-pipes 19, down through t e pipes 33, into the lower drum 29 of the superheater, thence through theare further cooled down by passage across.

the rear ortions of the b0ilertubes. When saturate steam is wanted the valves S5are opened and the steam-pipe 18 then. takes steam through the branches 17 direct from the dry-pipes 19', In such a case, there being no flow of steam to carry of? the heat imparted to the superheatentubes, it is desirable to flood the superheater with water, and

for this purpose I provide the following feedwater connections. water pipes, each having a branch 37 entering the forward end of one of the steam-and water drums 14 and extending along the bottom thereof to a down-turned end or out let-nozzle 38 directed into the downtake-pipe 16, and a second branch 39 extending over the roof of the boiler-setting and downwardly into the lower superheater-drum 29. The two branches of each feed-Water pi e are provided with stop-valves. 40, 11. hen the superheater is in use as a superheater only, the main boiler-feed branch 37 is opened, but when the superheater is to be flooded, the second branch 39 of the feedpipe is also 0 ened and then the feed-water flows in para lel through both branches to the boiler and superheater respectively, making of the superheater, for the time being; a secondary vaporizer which discharges its steam mainly through the pipe 34 into the main steam-pipe 18. The water level will be substantially the same in the boiler and 36 are the main feed-' eras-W in the superheater connections since the steam pressure is thesame for both, and both are fed by a common water-pipe branching in'parallel to the respective destinations. v

I claim I 1 A superheating-boiler comprising .a rain eva orating-structure having waterdrums and connecting tubes and a steam outlet, and asuperheater connected with said outlet and composed of two drums one of which is supported on one of said waterdrums, a connecting group of steam-tubes, and a series of holes formed in one of the drums opposite the ends of the tubes'an'd having removable covers, the arrangement being such that a pluralityof thesuperheater-tubes may be withdrawn through each hole. I l I 2. A superheating boilercomprising a main evaporating-structure having waterdrums and connecting tubes and a steam outlet, and. a superheater connected with said outlet and composed of a pair of drums one of which is supported on one of said wa-' terdruins, a series of curved tubes connecting said drums, and a row of holes formedin one of the drums opposite the ends of the,

tubes and having removable covers, each hole being adapted for the withdrawal of a plurality of said tubes.

3. A superheating-boiler com rising a main evaporating-structure, a boi er-casingj inclosing the same and having an opening tor the withdrawal of superheater-tubes, and

a superheater overlying the evaporating,

structure within the boiler-casing and ineluding a drum having a series of. open ngs provided with covers, and a group of steamtubesconnected with. said drum and withdrawable through said openings in the drum and in the casing. l e

4. A superheatingboiler com rising a main evaporating-structure, a boi er-casing inclosing said structure and having openings in opposite walls for the withdrawal of superheater-tubes, and a superheater overlying said evaporating-structure within the boilercasing and composed of two drums, each having a series of holes in its wall provided with removable covers, and a group of tubes" connecting said drums and wlthdrawable in opposite directions through said holes and through the respective openings in the walls of. the boiler-casing.

5. A superheating-boilr compris. .ig upper and lower water-drums connected by a group of inclined water-tubes, a steam-drum surmounting the upper water-drum, a boilercasing, and a supcrheater located within said casing between the boiler-tubes and the stean1-aml-water drum, and comprising a drmn-structure havin g openings for the withdrawal of tubes, removable covers for saidand a group of superheater-tubes openings,

connected with said drum-structure and withdrawable between the levels of the upper water-drum and the steam-and-water drum, through said openings and through an opening in the boiler-casing.

6. Asuperheating-boiler comprising upper and lower transverse water-drums connected by a group of inclined water-tubes, a longitudinal steam-and-water drum surmounting the said structure and having uptake and downtake connections with the respective water-drums, and a superheater mounted in r the space between the'water-tubes and. the

steam-and-water drum and comprising a drum supported on the upper water-drum, a second drum supported at a remote point, and a group 'of steam-tubes connecting said superheater-drums.

7. A superheating-boiler comprising upper and lower transverse water-drums connected by a group of water-tubes, a steam-and-water drum surmounting said structure and having uptake and downtake connections with the respective water-drums, gas-baffles for leading the furnace-gases in a sinuous path across the group of water-tubes, abafllewall extending between said group-oi tubes and the steam-and-water drum, and a superheater located in the gas-space above said group of water-tubes and comprising a drum supported on the upper water-drum, a second drum supported on the baffle-wall, and a group of tubes connecting the said superheater-drums.

8. A superheating-boiler comprising forward and rear transverse water-drums and connecting water-tubes constituting a main evaporating-structure, a longitudinal steamand-water drum surmounting said structure and having uptake and downtake connec tions with the res ective water-drums, a superheater located etween the main evapcrating-structure and the steam-and-water drum and compr1s1ng forward and rear supcrheater drums and a connecting group of tubes, steam connections extendlng upwar .lly from the respective superheaterdrums and communicating with the interior of the steam-and-water drum, valve mechanism for. causing the boiler-steam to pass either through the superheater or directly out from the steam-and-water drum, and feed-connections including a main feed-pi e having branches leading into the main boi erand superheater respectively, and provided with stop valves. v

In testimony whereof I have hereunto set my hand in the presence of two subscribingwitnesses, the 12th day of December, 1906.

CHARLES D. MOSHER.

Witnesses:

R. M. PIERsON, G. BLAKE. 

